Keystones — Capstone
Five GCSE retrieval questions · 27 January 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √180
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: x² - 11x + 7
Answer: (x - 11⁄2)² - 93⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 14cm, angle = 55°. Give your answer to 2 decimal places
Answer: 103.21cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 10:14:7 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 65, 56, 25, 24, 35, 15. Give your answer to 2 decimal places
Answer: Mean = 44.71, Median = 35, Range = 78